He doesn’t get to decide that. If Group X decides a song is their anthem it is. The writer doesn’t get a vote. A song doesn’t have to be about the people who decide it’s their anthem. They just have to like it. YMCA is a gay anthem. It just is.
I’ll bet it is played in more sports arenas than it is in queer bars. I see it as a sports anthem played to entertain the crowd while the dumbass referees and umpires try to figure out what call to make.
Next thing we’ll be told that “Die Hard” isn’t a Christmas movie.